RDAP: Remove port43 element from JSON output

According to Gustavo Lozano of ICANN: "In the case of the RDAP profile (gTLD space), the “port43” element is not expected to be used, because Whois/43 tcp will be deprecated in the future." So it sounds like we should not include the port43 element for the moment.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=130017966

javatests/google/registry/rdap/RdapDomainActionTest.java

@@ -124,7 +124,7 @@ public class RdapDomainActionTest {
     action.clock = clock;
     action.response = response;
     action.rdapLinkBase = "https://example.com/rdap/";
-    action.rdapWhoisServer = "whois.example.tld";
+    action.rdapWhoisServer = null;
 
     // history entries
     persistResource(
@@ -199,9 +199,6 @@ public class RdapDomainActionTest {
       if (!map.containsKey("remarks")) {
         RdapTestHelper.addDomainBoilerplateRemarks(builder);
       }
-      if (!map.containsKey("port43")) {
-        builder.put("port43", "whois.example.com");
-      }
       obj = builder.build();
     }
     return obj;